package com.reggie.controller;

import com.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {
    @Value("${reggie.path}")
    private String basePath;

//    文件上传下载
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){
//     file是一个临时文件,需要转存到指定位置,否则本次请求完成后临时文件会删除
      log.info(file.toString());

//      获取文件原始名
        String originalFilename = file.getOriginalFilename();
//      使用uuid重新生成文件名,防止文件重名覆盖
        String substring = originalFilename.substring(originalFilename.lastIndexOf("."));
        String fileName = UUID.randomUUID().toString()+substring;

//        创建一个目录对象
        File dir=new File(basePath);
//        判断目录是否存在
        if (!dir.exists()){
//            目录不存在,就创建
            dir.mkdirs();
        }

        try {
//            将上传的文件转存到指定路径
            file.transferTo(new File(basePath+fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(fileName);
    }

//    通过输出流将图片写回浏览器
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
        try {
            FileInputStream inputStream=new FileInputStream(new File(basePath+name));
             byte[] bytes=new byte[1024];
            ServletOutputStream outputStream = response.getOutputStream();
            response.setContentType("image/jpeg");
            int len=0;
            while ((len=inputStream.read(bytes))!=-1){
                outputStream.write(bytes);
                outputStream.flush();
            }
             inputStream.close();
            outputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
